Answer:
x = 30
Explanation:
One side is 90 so the other two sides have to add up to 90 too because a triangles' angles have to add up to 180.
So, we can write that 2x + x = 90
Then we can solve for x:
2x + x = 90
3x = 90
30
all angles add up to 180*, 180-90=90, 90=3x, 30=x
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